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Barcelona set to double tree population in major urban greening push

You may think there isn’t much space for a centuries-old, built-out city like Barcelona in Spain to radically greenify itself with double the amount of trees and expanded park space. But that’s exactly what the city aims to do. They recently rolled out a Plan of the Green and Biodiversity Barcelona 2020, including ambitious goals that could offer ideas to other dense cities needing greenery too.